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Research was carried out on the basis of investigations from the years 1996-1998 on the so-called monoliths in the soils derived from loess formations. Properties of those formations were differentiated by landscape and processes of water erosion. It was found out that post-sewage waters (waters received after sewage treatment) from a mechanical-biological sewage treatment plant have a more favourable influence on both the value of acidification indexes and relations between cations in the soils than solid mineral salts.
On the basis of obtained results a de-acidifying compost effect was proved. In the subsequent years, irrespective of the applied fertilization, a declining pH value was registered but also an increasing value of soil hydrolytic acidity. The highest acidification rate occurred in the soil with the mineral treatment. During the three year period of the investigations a decline in the organic C content in soil was noted for each treatment. Generally, by the end of the third year of the studies the total nitrogen content in the soils of individual treatments either remained on a similar level or was higher in relation to the content assessed after the first year. The share of available zinc and manganese forms in total content increased after three years of investigations. No such dependency was registered for copper and zinc. The value of electrolytic conductance in fertilized soil was over twice as high in comparison with the value determined in the control soil. The highest value of this parameter was noted in soil fertilized with farmyard manure. The soil content of phosphorus available forms was on a medium level after the experiment completion, whereas the amount of available potassium forms declined visibly in relation to content assessed in the soil prior to the experiment outset and reached a low level of abundance in the non-fertilized soil and in soil receiving mineral fertilizers.
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